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  Gamma-ray signatures from pair cascades in recombination-line radiation fields

Wendel, C., González, J. B., Shukla, A., Paneque, D., & Mannheim, K. (2021). Gamma-ray signatures from pair cascades in recombination-line radiation fields. Proceedings of Science, 395, 911.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000A-1BD6-7 Version Permalink: https://hdl.handle.net/21.11116/0000-000A-1BD7-6
Genre: Conference Paper

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 Creators:
Wendel, Christoph1, Author
González, Josefa Becerra1, Author
Shukla, Amit1, Author
Paneque, David1, Author
Mannheim, Karl1, Author
Affiliations:
1Max Planck Institute for Physics, Max Planck Society and Cooperation Partners, ou_2253650              

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Free keywords: MAGIC
 Abstract: Beams of ultra-relativistic electrons in blazar jets develop pair cascades interacting with ambient soft photons. Employing coupled kinetic equations with escape terms, we model the unsaturated pair cascade spectrum. We assume that the gamma rays predominantly scatter off recombination-line photons from clouds photoionised by the irradiation from the accretion disk and the jet. The cascade spectrum is rather insensitive to the injection of hard electron spectra associated with the short-time variability of blazars. Adopting physical parameters representative of Markarian 501 and 3C 279, respectively, we numerically obtain spectral energy distributions showing distinct features imprinted by the recombination-line photons. The hints for a peculiar feature at ~3 TeV in the spectrum of Markarian 501, detected with the MAGIC telescopes during a strong X-ray flux activity in 2014 July, can be explained in this scenario as a result of the up-scattering of line photons by beam electrons and the low pair-creation optical depth. Inspecting a high-fidelity Fermi-LAT spectrum of 3C 279 from January 2018 reveals troughs in the spectrum that coincide with the threshold energies for gamma rays producing pairs in collisions with recombination-line photons, and the absence of exponential attenuation. Our finding implies that the gamma rays in 3C 279 escape from the edge of the broad emission line region.

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 Dates: 2021
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: Other: MPP-2021-343
URI: https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2021-343
arXiv: arxiv:2108.02649
DOI: 10.22323/1.395.0911
URI: https://inspirehep.net/literature?q=find%20eprint%202108.02649
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Title: Proceedings of Science
  Abbreviation : PoS
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 395 Sequence Number: - Start / End Page: 911 Identifier: -

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Title: ICRC 2021
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 911 Identifier: -